Ensure that the Enable YouTube filter checkbox is checked. Scroll down to the YouTube Filter section.

Under Categories Blacklist, click the Select a category to blacklist drop-down menu and select a category, e.g. Autos & Vehicles. Click the Add button to add the category.

 

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Under Channels Blacklist, enter a URL to blacklist, and click the Add button to add the URL.

 

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Under Videos Blacklist, enter a URL to blacklist, and click the Add button to add the URL.

 

Conversely, using the Whitelist options will always allow specified categories or URLs.